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Acquisitions - (Power A -Unaudited Pro Forma Consolidated Results) (Details) - PowerA - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition [Line Items] |  |
Net sales | $ 1,857.2 | $ 2,124.0
Net income | $ 76.9 | $ 120.0
Net income per common share (diluted) (in usd per share) | $ 0.80 | $ 1.19
Selling, General and Administrative Expenses [Member] |  |
Business Acquisition [Line Items] |  |
Transaction costs | $ 3.7 |

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- Definition The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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